As a card carrying old person, who was once young, I can say that the "it was uphill both ways to school and we had to walk barefoot in the snow" arguments don;t convince anyone. The fact that we toted around SVTs - and I did too - doesn;t make they guy's Twin any lighter. I used to do a lot of field service, but it got to the point I could no longer comfortably lug my 50 pound tool kit down narrow stairs into basement game rooms.
I am not whining, it just is too heavy. Can I GET it down those stairs? Yes, I can. But it hurts, and is not conducive to doing good work.
I used to have a Rickenbacher bass I really loved to play. I couldn;t tell you the model, I haven't had it since about 1972. It was a shallow hollow body. The neck stuck out a mile and was heavy. I dearly loved that neck to play, but it weighed the guitar down - it was tiring to wear, plus it was poorly balanced. The strap anchored to the ends of the body and the neck pulled itself down. To keep it level, I would have had to anchor the strap at the head stock. But in general, it was just too heavy. I could heft it, I could wear it and play it, but it wasn't fun.
I got no problem with someone who wants a sound but doesn't want to heft a 60 pound thing. I prefer tube amps myself for guitar, but not everyone wants to be macho shifting cargo around like a longshoreman.
As to the weight, we can save the weight of the power transformer by going to SMPS for power. They weigh no more than a reverb pan. The magnet assembly is a major contributor to speaker weight. Neodymium magnets weigh a lot mess than ceramic magnets, Maybe we can save some weight by making cabs from carbon fiber or some such.